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- Committer: Teddy Hogeborn
- Date: 2014-06-22 02:19:30 UTC
- Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
60
59
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
*/
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
64
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
239
234
.af = af };
240
235
if(new_server->ip == NULL){
241
236
perror_plus("strdup");
242
free(new_server);
243
237
return false;
244
238
}
245
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
240
if(ret == -1){
247
241
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
242
return false;
258
243
}
259
244
/* Special case of first server */
310
295
return false;
311
296
}
312
297
313
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
299
if(ret == -1){
315
300
perror_plus("close");
316
301
}
498
483
return plaintext_length;
499
484
}
500
485
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
486
__attribute__((warn_unused_result))
509
487
static const char *safer_gnutls_strerror(int value){
510
488
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
512
492
}
513
493
514
494
/* GnuTLS log function callback */
518
498
fprintf_plus(stderr, "GnuTLS: %s", string);
519
499
}
520
500
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
522
502
static int init_gnutls_global(const char *pubkeyfilename,
523
503
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
504
mandos_context *mc){
526
505
int ret;
527
unsigned int uret;
528
506
529
507
if(debug){
530
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
509
}
532
510
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
533
518
if(debug){
534
519
/* "Use a log level over 10 to enable all debugging options."
535
520
* - GnuTLS manual
543
528
if(ret != GNUTLS_E_SUCCESS){
544
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
546
532
return -1;
547
533
}
548
534
573
559
safer_gnutls_strerror(ret));
574
560
goto globalfail;
575
561
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
749
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
570
751
571
return 0;
753
573
globalfail:
754
574
755
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
756
577
gnutls_dh_params_deinit(mc->dh_params);
757
578
return -1;
758
579
}
810
631
/* ignore client certificate if any. */
811
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
813
636
return 0;
814
637
}
815
638
817
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
641
__attribute__((unused)) const char *txt){}
819
642
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
1038
643
/* Called when a Mandos server is found */
1039
644
__attribute__((nonnull, warn_unused_result))
1040
645
static int start_mandos_communication(const char *ip, in_port_t port,
1051
656
int retval = -1;
1052
657
gnutls_session_t session;
1053
658
int pf; /* Protocol family */
1054
bool route_added = false;
1055
659
1056
660
errno = 0;
1057
661
1079
683
bool match = false;
1080
684
{
1081
685
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1085
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
689
match = true;
1087
690
break;
1116
719
PRIuMAX "\n", ip, (uintmax_t)port);
1117
720
}
1118
721
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
723
if(tcp_sd < 0){
1121
724
int e = errno;
1122
725
perror_plus("socket");
1129
732
goto mandos_end;
1130
733
}
1131
734
735
memset(&to, 0, sizeof(to));
1132
736
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1136
739
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1140
742
}
1141
743
if(ret < 0 ){
1142
744
int e = errno;
1212
814
goto mandos_end;
1213
815
}
1214
816
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1270
836
}
1271
837
1272
838
const char *out = mandos_protocol_version;
1426
992
&decrypted_buffer, mc);
1427
993
if(decrypted_buffer_size >= 0){
1428
994
1429
clearerr(stdout);
1430
995
written = 0;
1431
996
while(written < (size_t) decrypted_buffer_size){
1432
997
if(quit_now){
1448
1013
}
1449
1014
written += (size_t)ret;
1450
1015
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
1016
retval = 0;
1462
1017
}
1463
1018
}
1466
1021
1467
1022
mandos_end:
1468
1023
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1475
1024
int e = errno;
1476
1025
free(decrypted_buffer);
1477
1026
free(buffer);
1478
1027
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
1029
}
1481
1030
if(ret == -1){
1482
1031
if(e == 0){
1517
1066
timed out */
1518
1067
1519
1068
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
1069
return;
1522
1070
}
1523
1071
1637
1185
__attribute__((nonnull, warn_unused_result))
1638
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1187
int ret;
1640
int old_errno;
1188
error_t ret_errno;
1641
1189
1642
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1191
if(s < 0){
1644
old_errno = errno;
1192
ret_errno = errno;
1645
1193
perror_plus("socket");
1646
errno = old_errno;
1194
errno = ret_errno;
1647
1195
return false;
1648
1196
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1651
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1199
if(ret == -1){
1653
1200
if(debug){
1654
old_errno = errno;
1201
ret_errno = errno;
1655
1202
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1203
errno = ret_errno;
1657
1204
}
1658
1205
return false;
1659
1206
}
1904
1451
}
1905
1452
}
1906
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1907
1506
__attribute__((nonnull))
1908
1507
void run_network_hooks(const char *mode, const char *interface,
1909
1508
const float delay){
1910
1509
struct dirent **direntries = NULL;
1911
1510
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1511
hookdir_fd = open(hookdir, O_RDONLY);
1914
1512
if(hookdir_fd == -1){
1915
1513
if(errno == ENOENT){
1916
1514
if(debug){
1923
1521
return;
1924
1522
}
1925
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1926
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1928
1536
if(numhooks == -1){
1929
1537
perror_plus("scandir");
1930
1538
return;
1931
1539
}
1932
1540
struct dirent *direntry;
1933
1541
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1542
int devnull = open("/dev/null", O_RDONLY);
1939
1543
for(int i = 0; i < numhooks; i++){
1940
1544
direntry = direntries[i];
1941
1545
if(debug){
1965
1569
perror_plus("setgroups");
1966
1570
_exit(EX_NOPERM);
1967
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1968
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
1588
if(ret == -1){
1970
1589
perror_plus("setenv");
2005
1624
_exit(EX_OSERR);
2006
1625
}
2007
1626
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2011
1628
if(hook_fd == -1){
2012
1629
perror_plus("openat");
2013
1630
_exit(EXIT_FAILURE);
2014
1631
}
2015
if(close(hookdir_fd) == -1){
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2016
1633
perror_plus("close");
2017
1634
_exit(EXIT_FAILURE);
2018
1635
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
1637
environ) == -1){
2036
1638
perror_plus("fexecve");
2037
1639
_exit(EXIT_FAILURE);
2038
1640
}
2039
1641
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
1642
int status;
2046
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
1644
perror_plus("waitpid");
2048
free(direntry);
2049
1645
continue;
2050
1646
}
2051
1647
if(WIFEXITED(status)){
2053
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
1650
" with status %d\n", direntry->d_name,
2055
1651
WEXITSTATUS(status));
2056
free(direntry);
2057
1652
continue;
2058
1653
}
2059
1654
} else if(WIFSIGNALED(status)){
2060
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
1656
" signal %d\n", direntry->d_name,
2062
1657
WTERMSIG(status));
2063
free(direntry);
2064
1658
continue;
2065
1659
} else {
2066
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
1661
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
1662
continue;
2070
1663
}
2071
1664
}
2073
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
1667
direntry->d_name);
2075
1668
}
2076
free(direntry);
2077
1669
}
2078
1670
free(direntries);
2079
if(close(hookdir_fd) == -1){
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2080
1672
perror_plus("close");
2081
1673
} else {
2082
1674
hookdir_fd = -1;
2085
1677
}
2086
1678
2087
1679
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2091
1683
int ret;
2092
1684
struct ifreq network;
2093
1685
unsigned int if_index = if_nametoindex(interface);
2103
1695
}
2104
1696
2105
1697
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
1698
error_t ret_errno = 0, ioctl_errno = 0;
2108
1699
if(not get_flags(interface, &network)){
2109
1700
ret_errno = errno;
2110
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2123
1714
}
2124
1715
2125
1716
if(quit_now){
2126
ret = close(sd);
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2127
1718
if(ret == -1){
2128
1719
perror_plus("close");
2129
1720
}
2179
1770
}
2180
1771
2181
1772
/* Close the socket */
2182
ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1774
if(ret == -1){
2184
1775
perror_plus("close");
2185
1776
}
2197
1788
2198
1789
/* Sleep checking until interface is running.
2199
1790
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
1791
for(int i=0; i < delay * 4; i++){
2201
1792
if(interface_is_running(interface)){
2202
1793
break;
2203
1794
}
2213
1804
}
2214
1805
2215
1806
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2218
1809
struct ifreq network;
2219
1810
unsigned int if_index = if_nametoindex(interface);
2220
1811
if(if_index == 0){
2223
1814
return ENXIO;
2224
1815
}
2225
1816
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
1817
error_t ret_errno = 0, ioctl_errno = 0;
2228
1818
if(not get_flags(interface, &network) and debug){
2229
1819
ret_errno = errno;
2230
1820
fprintf_plus(stderr, "Failed to get flags for interface "
2268
1858
}
2269
1859
2270
1860
/* Close the socket */
2271
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
1862
if(ret == -1){
2273
1863
perror_plus("close");
2274
1864
}
2289
1879
}
2290
1880
2291
1881
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2297
1886
AvahiSServiceBrowser *sb = NULL;
2298
1887
error_t ret_errno;
2299
1888
int ret;
2308
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1898
const char *seckey = PATHDIR "/" SECKEY;
2310
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
1900
char *interfaces_hooks = NULL;
2313
1901
2314
1902
bool gnutls_initialized = false;
2367
1955
.doc = "Bit length of the prime number used in the"
2368
1956
" Diffie-Hellman key exchange",
2369
1957
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2375
1958
{ .name = "priority", .key = 130,
2376
1959
.arg = "STRING",
2377
1960
.doc = "GnuTLS priority string for the TLS handshake",
2432
2015
}
2433
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
2017
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
2018
case 130: /* --priority */
2439
2019
mc.priority = arg;
2440
2020
break;
2480
2060
.args_doc = "",
2481
2061
.doc = "Mandos client -- Get and decrypt"
2482
2062
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2486
2066
case 0:
2487
2067
break;
2488
2068
case ENOMEM:
2489
2069
default:
2490
errno = ret_errno;
2070
errno = ret;
2491
2071
perror_plus("argp_parse");
2492
2072
exitcode = EX_OSERR;
2493
2073
goto end;
2496
2076
goto end;
2497
2077
}
2498
2078
}
2499
2079
2500
2080
{
2501
2081
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2503
2083
2504
2084
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2508
2088
perror_plus("Failed to raise privileges");
2509
2089
} else {
2510
2090
struct stat st;
2526
2106
}
2527
2107
}
2528
2108
}
2529
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
2110
}
2531
2111
}
2532
2112
2533
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2535
2115
if(pubkey_fd == -1){
2547
2127
}
2548
2128
}
2549
2129
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2576
2134
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2580
2138
perror_plus("Failed to lower privileges");
2581
2139
}
2582
2140
}
2707
2265
if(ret_errno != 0){
2708
2266
errno = ret_errno;
2709
2267
perror_plus("argz_add");
2710
free(direntries[i]);
2711
2268
continue;
2712
2269
}
2713
2270
if(debug){
2714
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
2272
direntries[i]->d_name);
2716
2273
}
2717
free(direntries[i]);
2718
2274
}
2719
2275
free(direntries);
2720
2276
} else {
2752
2308
errno = bring_up_interface(interface, delay);
2753
2309
if(not interface_was_up){
2754
2310
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2311
perror_plus("Failed to bring up interface");
2757
2312
} else {
2758
2313
errno = argz_add(&interfaces_to_take_down,
2759
2314
&interfaces_to_take_down_size,
2782
2337
goto end;
2783
2338
}
2784
2339
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2786
2341
if(ret == -1){
2787
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2343
exitcode = EX_UNAVAILABLE;
2910
2465
2911
2466
/* Allocate a new server */
2912
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2468
&config, NULL, NULL, &ret_errno);
2914
2469
2915
2470
/* Free the Avahi configuration data */
2916
2471
avahi_server_config_free(&config);
2919
2474
/* Check if creating the Avahi server object succeeded */
2920
2475
if(mc.server == NULL){
2921
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2477
avahi_strerror(ret_errno));
2923
2478
exitcode = EX_UNAVAILABLE;
2924
2479
goto end;
2925
2480
}
2960
2515
end:
2961
2516
2962
2517
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2519
}
2971
2520
2972
2521
/* Cleanup things */
2983
2532
2984
2533
if(gnutls_initialized){
2985
2534
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
2986
2536
gnutls_dh_params_deinit(mc.dh_params);
2987
2537
}
2988
2538
2996
2546
mc.current_server->prev->next = NULL;
2997
2547
while(mc.current_server != NULL){
2998
2548
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
3007
2549
free(mc.current_server);
3008
2550
mc.current_server = next;
3009
2551
}
3011
2553
3012
2554
/* Re-raise privileges */
3013
2555
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3017
2559
perror_plus("Failed to raise privileges");
3018
2560
} else {
3019
2561
3024
2566
/* Take down the network interfaces which were brought up */
3025
2567
{
3026
2568
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
3033
2575
perror_plus("Failed to take down interface");
3034
2576
}
3035
2577
}
3040
2582
}
3041
2583
}
3042
2584
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3046
2588
perror_plus("Failed to lower privileges permanently");
3047
2589
}
3048
2590
}
3050
2592
free(interfaces_to_take_down);
3051
2593
free(interfaces_hooks);
3052
2594
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
2595
/* Removes the GPGME temp directory and all files inside */
3110
2596
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
3112
2637
}
3113
2638
3114
2639
if(quit_now){
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